Butterfinger is a candy bar manufactured by the Ferrara Candy Company, a subsidiary of Ferrero. The bar consists of a layered crispy peanut butter core covered in chocolate. Butterfinger was invented by Otto Schnering in 1923. Schnering had founded the Curtiss Candy Company near Chicago, Illinois, in 1922. The company held a public contest to choose the name of this candy. In an early marketing campaign, the company dropped Butterfinger and Baby Ruth candy bars from airplanes in cities across the United States as a publicity stunt that helped increase its popularity.
In "Mother Tucker", Brian compares him selling out to when Stewie starred in Butterfinger commercials. A cutaway then plays of Stewie sitting on a park bench eating a Butterfinger. The commercial is meant to parody the Butterfinger commercials The Simpsons did in the early 1990s, as Stewie uses Bart's catchphrase "Nobody better lay a finger on my Butterfinger", adding a forced " D'oh!" in reference to Homer's catchphrase.
In "Halloween on Spooner Street", it is parodied as a "Not a Finger".